U.S. patent application number 17/447837 was filed with the patent office on 2022-01-06 for fast inflating air pump.
The applicant listed for this patent is Jinhua Chen. Invention is credited to Jinhua Chen.
Application Number | 20220003225 17/447837 |
Document ID | / |
Family ID | |
Filed Date | 2022-01-06 |
United States Patent
Application |
20220003225 |
Kind Code |
A1 |
Chen; Jinhua |
January 6, 2022 |
FAST INFLATING AIR PUMP
Abstract
The present invention discloses a fast inflating air pump,
including a housing, an inflating tube, an inlet tube, a motor, a
transmission assembly and a controller housed in the housing. A
blower is arranged in the inlet tube for increasing air pressure to
the inflating port. A piston is at least partially contained in the
inflating tube, and the piston is driven by the motor via the
transmission assembly so as to slide back and forth linearly for
increasing air pressure in the inflating tube. A one-way valve is
installed in the communicating pipe for only allowing air flow into
the inflating tube. The controller instructs the motor to drive the
piston to slide back and forth in the inflation tube on condition
that the blower stops working until the air inflation pressure
increases to a predetermined threshold, then the controller
instructs the motor to stop operating.
Inventors: |
Chen; Jinhua; (Puning,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Chen; Jinhua |
Puning |
|
CN |
|
|
Appl. No.: |
17/447837 |
Filed: |
September 16, 2021 |
International
Class: |
F04B 39/10 20060101
F04B039/10; F04B 39/00 20060101 F04B039/00; F04B 35/04 20060101
F04B035/04; F04B 49/06 20060101 F04B049/06; F04B 25/00 20060101
F04B025/00; F04B 39/12 20060101 F04B039/12 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 30, 2021 |
CN |
202122061944.8 |
Claims
1. A fast inflating air pump comprising: a housing including an
upper shell and a lower shell; an inflating tube including an
inflating port exposed on the outside of the housing, an inlet tube
including an inlet port exposed on the outside of the housing for
communicating with external air, a communicating pipe arranged
between the inflating tube and the inlet tube for communicating
with each other, a motor, a transmission assembly and a controller;
and wherein a blower is arranged in the inlet tube for increasing
air pressure to the inflating port; a piston is at least partially
contained in the inflating tube, the piston is driven by the motor
via the transmission assembly so as to slide back and forth
linearly for increasing air pressure in inflating tube; a one-way
valve is installed in the communicating pipe for only allowing air
flow into the inflating tube; the controller instructs the blower
to work until an air inflation pressure reaches a predetermined
threshold, then the controller instructs the blower to stop
working; the controller instructs the motor to drive the piston to
slide back and forth in the inflation tube on condition that the
blower stops working until the air inflation pressure increases to
another predetermined threshold, then the controller instructs the
motor to stop operating.
2. The fast inflating air pump as described in claim 1, wherein the
inflating tube includes a small-diameter section and a
large-diameter section extending from the small-diameter section, a
diameter of the large-diameter section larger than that of the
small-diameter section, the inflation port is formed in the
small-diameter section and the piston movably slides in the large
diameter section of the inflating tube.
3. The fast inflating air pump as described in claim 1, wherein the
piston includes a head end, a tail end and a piston rod between the
head end and the tail end.
4. The fast inflating air pump as described in claim 3, wherein the
transmission assembly includes a gear plate driven by the motor, an
eccentric wheel, a rotating shaft located in the centre of the gear
plate and connected to the eccentric wheel, and a transmission rod
located on the eccentric wheel for connecting with the piston.
5. The fast inflating air pump as described in claim 4, wherein the
gear plate drives the eccentric wheel to rotate via the rotating
shaft, and the eccentric wheel pushes or pulls the piston to slide
via the transmission rod.
6. The fast inflating air pump as described in claim 4, wherein the
tail end of the piston includes a ring and a hole provided on the
ring, and the transmission rod is sleeved in the ring.
7. The fast inflating air pump as described in claim 4, wherein the
gear plate has an external teeth provided on the outer periphery of
the gear plate, the motor has a shaft with a transmission gear, and
the external teeth of the gear plate meshes with the transmission
gear of the motor.
8. The fast inflating air pump as described in claim 4, wherein a
valve plate mounted in the inflating tube is located above the head
end of the piston for allowing air flow into the inflating port of
the inflating tube only.
9. The fast inflating air pump as described in claim 8, wherein the
valve plate includes a rigid sheet with a plurality of holes, and a
rubber sheet is attached to the rigid sheet for blocking the
plurality of holes of the rigid sheet.
10. The fast inflating air pump as described in claim 8, wherein
the head end of the piston is in shape of a disc with a plurality
of holes, and a damper is mounted on the head end and covers the
plurality of holes of the head end.
11. The fast inflating air pump as described in claim 10, wherein
the head end further has an upper flange on the periphery of the
disc, an upper flange on the periphery of the disc and a ring
groove between the upper flange and the lower flange for mounting
the damper.
12. The fast inflating air pump as described in claim 11, wherein
the damper has a central part for covering the he plurality of
holes of the head end, two bridges extending from the central part
along a direction far away each other, and an annular wall located
on the outer peripheral side of the two bridges and connected to
the two bridges.
13. The fast inflating air pump as described in claim 12, wherein
the annular wall has an inner wall extending from the two bridges,
an outer wall extending from the inner wall and a groove provided
between the inner wall and the outer wall.
14. The fast inflating air pump as described in claim 12, wherein
two notches are provided on the upper flange of the head end of the
piston for matching the two bridges of the damper,
respectively.
15. The fast inflating air pump as described in claim 10, wherein
an air chamber is formed by the valve plate, the head end with the
damper and a part of the large-diameter section of the inflating
tube.
16. The fast inflating air pump as described in claim 1, wherein
the controller is provided with a controlling circuit for
controlling the operation of the air pump, and includes a power
supply, a power switch, a controlling unit and two selecting
switches, each of the two selecting switches has an input terminal
connected with the power supply, an output terminal connected with
the air pump, a ground terminal, and a controlling terminal
connected with the controlling unit, the selecting switch includes
a connecting terminal connected to the air pump, and the connecting
terminal of the selecting switch is selectively connected to the
input terminal or the ground terminal of the selecting switch
according to an selecting signal from the controlling unit.
17. The fast inflating air pump as described in claim 16, wherein
each of the two selecting switches includes two field effect
transistors with different conduction potentials, the two field
effect transistors define a first field effect transistor and a
second field effect transistor, a source or a drain of the first
field effect transistor severed as the input terminal of the
selecting switch, the drain or source of the first field effect
transistor connected to a source or a drain of the second field
effect transistor as the output terminal of the selecting switch,
the drain or the source of the second field effect transistor
served as the ground terminal of the selecting switch, a grids of
the two field effect transistors connected as the controlling
terminal of the selecting switch.
18. The fast inflating air pump as described in claim 17, wherein
the two field effect transistors are defined an N-channel field
effect transistor or a P-channel field effect transistor.
19. The fast inflating air pump as described in claim 18, wherein
the controller includes a flip-flop and two triodes, a base of the
two triodes are respectively connected to two output terminals of
the flip-flop, a collector of the two triodes are respectively
connected to the controlling terminals of the two selecting
switches, and a emitter of the two triodes connected with the
ground respectively, the flip-flop outputs a high and a low-level
signal to make one of the two triodes turn on, and the other turns
off.
Description
FIELD OF THE DISCLOSURE
[0001] The present disclosure relates to an air pump, and more
particularly to a fast electric inflating air pump.
BACKGROUND
[0002] The inflating air pump works by an electric motor. The
working principle is that the motor pimps air into objects that
need to be inflated, such as tires, boat cushions, etc., which can
realize the effect of inflation automatically.
[0003] Generally, the inflating pump uses a single inflating
method, that is, it is driven by a motor to inflate the object to
be inflated. As the pressure of the object to be inflated changes
before and during the inflation process, as it is inflated, its
pressure becomes greater and greater. The single inflation method
leads to the defects of low inflation efficiency and long inflation
time. In addition, due to the poor airtightness during the
inflation process, air leakage occurs, which makes the working
efficiency of the inflator pump even lower.
[0004] Therefore, it is necessary to provide a fast electric
inflating air pump for solving the issues.
SUMMARY OF THE INVENTION
[0005] In view of this, the present disclosure is designed to
provide a fast electric inflating air pump to solve the problem of
low inflation efficiency.
[0006] A fast inflating air pump comprises a housing, a controller,
a blower, a motor, an inlet tube and an inflating tube are arranged
in the housing. The inflating tube includes an inflating port which
is exposed on the outside of the housing to communicate with
external air. A piston is at least partially received in the
inflating tube. The motor drives the piston to linearly slide back
and forth in the inflating tube via a transmission assembly. The
inflating pipe is communicated with the inlet tube via a
communicating pipe. A blower is housed in the inlet tube. A one-way
valve is provided in the communicating pipe so that air flows from
the communicating pipe to the inflating tube. During the fast
inflating air pump is inflating, the controller instructs the
blower to operate until an air pressure value reaches a
predetermined threshold, and the controller instructs the blower to
stop working. At this moment, the controller instructs the motor to
drive the piston to move back and forth in the inflating tube to
achieve inflation, until the air pressure value increases to
another predetermined threshold, then the controller instructs the
motor to stop operating.
[0007] In another aspect, the inlet tube includes an inlet port
which is exposed on the outside of the housing for communicating
with external air, and another port is communicated with the
communicating pipe.
[0008] In another aspect, the inflating tube includes a
small-diameter section and a large-diameter section extending from
the small-diameter section, the inflation port is formed in the
small-diameter section. A diameter of the large-diameter section is
larger than that of the small-diameter section. The piston is
movably placed in the large-diameter section, and on condition that
the controller instructs the motor to drive the piston to move, the
piston linearly moves back and forth in the large-diameter
section.
[0009] In another aspect, the piston includes a head end, a tail
end and a piston rod between the head end and the tail end. The
transmission assembly includes a gear plate driven by the motor, an
eccentric wheel, a rotating shaft located in the center of the gear
plate and connected to the eccentric wheel, and a transmission rod
located on the eccentric wheel, and the transmission rod is sleeved
on the tail end of the piston. The motor drives the gear plate to
rotate, and the gear plate drives the head end of the piston to
linearly slide back and forth in the inflating tube via the
eccentric wheel.
[0010] In another aspect, the tail end of the piston has a hole
provided in the central area of the tail end, and the transmission
rod is at least partially sleeved in the hole.
[0011] In another aspect, a frame connected with an inflating tube
is arranged in the housing, and the gear plate is supported by the
frame.
[0012] In another aspect, the gear plate has an external teeth
provided on the outer periphery of the gear plate. The motor has a
shaft with a transmission gear, the gear plate meshes with the
transmission gear of the motor.
[0013] In another aspect, the blower is arranged in the inlet
tube.
[0014] In another aspect, the controller is provided with a
controlling circuit for controlling the operation of the air pump,
including a power supply, a power switch, a controlling unit and
two selecting switches. Each of the two selecting switches has an
input terminal connected with the power supply, an output terminal
connected with the air pump, a ground terminal, and a controlling
terminal connected with the controlling unit. The selecting switch
includes a connecting terminal connected to the air pump, and the
connecting terminal of the selecting switch is selectively
connected to the input terminal or the ground terminal of the
selecting switch according to an selecting signal from the
controlling unit.
[0015] In another aspect, an output terminal of a first selecting
switch is connected with the input terminal or the ground terminal
of the selecting switch, and an output terminal of a second
selecting switch is connected with the ground terminal or the input
terminal of the selecting switch correspondingly.
[0016] In another aspect, each of the two selecting switches
includes two field effect transistors with different conduction
potentials. The two field effect transistors define first field
effect transistor and a second field effect transistor. A source or
a drain of the first field effect transistor severs as the input
terminal of the selecting switch. The drain or source of the first
field effect transistor is connected to a source or a drain of the
second field effect transistor as the output terminal of the
selecting switch. The drain or the source of the second field
effect transistor serves as the ground terminal of the selecting
switch. A grids of the two field effect transistors are connected
as the controlling terminal of the selecting switch.
[0017] In another aspect, the field effect transistor is defined as
an N-channel field effect transistor or a P-channel field effect
transistor.
[0018] In another aspect, the controller includes a flip-flop and
two triodes. A bases of the two triodes are respectively connected
to the two output terminals of the flip-flop, a collector of the
two triodes are respectively connected to the controlling terminals
of the two selecting switches, and a emitter of the two triodes
connected with the ground respectively. The flip-flop outputs a
high and a low-level signal to make one of the two triodes turn on,
and the other turns off.
[0019] In another aspect, the flip-flop is a set-reset flip-flop,
or a jump-key flip-flop or a D-type flip-flop.
[0020] The fast inflating air pump provided by the present
disclosure, the controller instructs the blower to restart the
rapid inflation, until the inflation pressure reaches a
predetermined threshold, then stops the blower, and synchronously
instructs the motor to drive the piston to move back and forth to
inflate to achieve high pressure inflation. The inflation pressure
reaches a predetermined threshold, so that the low pressure and
high pressure are sequentially converted to inflate, and the effect
of fast inflation can be achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Many aspects of the embodiments can be better understood
with reference to the following drawings. The components in the
drawings are not necessarily drawn to scale, the emphasis instead
being placed upon clearly illustrating the principles of the
embodiment.
[0022] FIG. 1 is an isometric view of an inflating air pump in
accordance with an exemplary embodiment of the present disclosure,
with a part of a housing thereof being removed away.
[0023] FIG. 2 is an isometric view of the inflating air pump in
FIG. 1, viewed from another aspect, with the housing thereof being
removed away.
[0024] FIG. 3 is an isometric exploded view of the inflating air
pump in FIG. 1.
[0025] FIG. 4 is an isometric exploded view of a part of the
inflating air pump in FIG. 1.
[0026] FIG. 5 depicts an assembled view of a motor and a
transmission assembly of the inflating air pump in accordance with
an embodiment of the present disclosure.
[0027] FIG. 6 is a cross-sectional view of an inflating tube of the
inflating air pump in FIG. 1.
[0028] FIG. 7 is a schematic diagram of an controlling circuit of
the inflating air pump of the present disclosure.
[0029] FIG. 8 is a topological structure diagram of the controlling
circuit of the inflating air pump in FIG. 7.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0030] Embodiments of the present disclosure will be described in
detail in conjunction with the drawings. It should be noted that
the figures are illustrative rather than limiting. The figures are
not drawn to scale, do not illustrate every aspect of the described
embodiments, and do not limit the scope of the present
disclosure.
[0031] It should be noted that when a component is considered to be
"connected" to another component, it can be directly connected to
another component or a central component can be present between two
components at the same time. When a component is considered to be
"provided" another component, it may be arranged directly on
another component or possibly with a centered component.
[0032] Unless otherwise defined, all technical and scientific terms
used herein have the same meaning, which is used in the description
of the present disclosure to describe specific embodiments and is
not intended to limit the disclosure. The term "or/and" used here
includes any and all combinations of one or more of the associated
listed items.
[0033] Referring to FIGS. 1-8, a fast inflating air pump according
to an embodiment of the present disclosure is shown. The fast
inflating air pump comprises a housing 100 having an upper shell
1012 and a lower shell 1011, a controller 800, a blower 501, a
motor 400, an inlet tube 203 and an inflating tube are arranged in
the housing 100. The inflating tube includes an inflating port 102
which is exposed on the outside of the housing 100 to communicate
with external air. A piston is at least partially received in the
inflation tube. The piston includes a head end 700, a tail end 702
and a piston rod 701 between the head end 700 and the tail end 702.
The motor 400 drives the piston to linearly slide back and forth in
the inflating tube via a transmission assembly for increasing air
pressure in the inflating tube. During the reciprocating motion
cycle, the piston continuously outputs air to the inflating port
102 of the inflating tube, so that the inflating pump outputs air
under high pressure.
[0034] A communicating pipe 300 is arranged between the inflating
tube and the inlet tube 203, and a one-way valve 500 is arranged in
the communicating pipe 300. The one-way valve 500 unidirectionally
circulates air from the communicating pipe 300 to the inflating
pipe. Thus, the blower 501 in the inlet tube 203 drives the air to
be discharged through the inflating port 102 of the inflating
tube.
[0035] During the fast inflating air pump is inflating, the
controller 800 instructs the blower 501 to work until an air
pressure value reaches a predetermined threshold, and the
controller 800 instructs the blower 501 to stop working. At this
moment, the controller 800 instructs the motor 400 to drive the
piston to move back and forth in the inflating tube to achieve
inflation, until the air pressure value increases to another
predetermined threshold, then the controller 800 instructs the
motor 400 to stop operating.
[0036] In order to improve the inflation efficiency, the controller
800 first instructs the blower 501 to rotate to inflate a target
object, such as a tire, until an internal air pressure of the
inflating air pump reaches a predetermined threshold, and then
instructs the blower 501 to stop working. At this moment, the motor
400 is immediately started to drive the piston to slide back and
forth to inflate into the inflating tube to achieve inflation under
a relatively high pressure state until the air pressure of the
inflating pump reaches another predetermined threshold. During this
process, the internal air pressure of the inflating air pump is
increased from a low air pressure to a relatively high air pressure
to achieve the effect of rapid inflation.
[0037] In the embodiment, the upper shell 1011 and the lower shell
1012 enclose a housing 100 with a cavity. The housing 100 may also
be enclosed by other components, and is not limited to the enclosed
manner of the upper shell 1011 and the lower shell 1012 in the
present disclosure.
[0038] The inlet tube 203 includes an inlet port 101 which is
exposed on the outside of the housing 100 for communicating with
external air, and another port is communicated with the inflating
tube via the communicating pipe 300.
[0039] The inflating tube includes a small-diameter section 201 and
a large-diameter section 202 extending from the small-diameter
section 201, the inflation port 102 is formed in the small-diameter
section 201. The terms "large diameter" and "small diameter" here
are relative sizes and do not have the concept of actual size. A
diameter of the large-diameter section 202 is larger than that of
the small-diameter section 201. The piston is movably placed in the
large-diameter section 202, and on condition that the controller
800 instructs the motor 400 to drive the piston to move, the piston
linearly moves back and forth in the large-diameter section
202.
[0040] In the embodiment, the head end 700 of the piston is
received in the large-diameter section 202 of the inflating tube.
The head end 700 of the piston is in shape of a disc that matches
an inner wall of the large-diameter section 202 of the inflating
tube, and a plurality of holes 704 are provided in the central area
of the disc of the head end 700. A damper 710 is mounted on the
disc-shaped head end 700 of the piston. A valve plate 601 is
located above the head end 700 in the large diameter portion. The
valve plate 601 includes a rigid sheet 602 with a plurality of
holes provided in the inflation tube, and a rubber sheet 603 which
is attached to the rigid sheet 602 to block the holes so that air
can only flow from the head end 700 through the hole into the
inflation port 102. The valve plate 601 acts as a one-way
valve.
[0041] In the embodiment, the head end 700 further has an upper
flange 705 on the periphery of the disc, an upper flange 706 on the
periphery of the disc and a ring groove 707 between the upper
flange 705 and the lower flange 706 for receiving the damper 710.
The damper 710 has a central part 711, two bridges 712 extending
from the central part 711 along a direction far away each other and
an annular wall located on the outer peripheral side of the two
bridges 712 and connected to the two bridges 712. The annular wall
has an inner wall 713 extending from the two bridges 712, an outer
wall 714 extending from the inner wall 713 for sliding contact with
the inflating tube, and a groove 715 provided between the inner
wall 713 and the outer wall 714. The central part 711 of the damper
710 blocks a plurality of holes 704 of the head end 700 so that air
can only flow into the inflating tube. In order to avoid air
leakage, two notches 708 are provided on the upper flange 705 for
matching the two bridges 712. The two bridges 712 are respectively
arranged in the two notches 708 to improve the firmness of the
damper 710. An air chamber is formed by the valve plate 601, an
head end 700 with the damper 710 and a part of the large-diameter
section 202 of the inflating tube. When the piston slides back and
forth in the large-diameter section 202, the head end 700 slides
along a direction gradually approaching the valve plate 601, and
the air in the air chamber can only flow into the small-diameter
section 201 through the holes of the valve plate 601. When the head
end 700 slides along a direction gradually away from the valve
plate 601, the holes of the valve plate 601 is blocked by the
rubber sheet 603, and air enters the air chamber through the holes
of the head end 700 for balancing air pressure. The rotation speed
of the motor 400 may reach 10,000 revolutions per minute. Driven by
the high frequency of the motor 400, the piston quickly presses the
air in the air chamber into the inflating tube for obtaining high
air pressure. This enhances the inflation efficiency of the
inflating air pump and can meet higher pressure inflation
requirements with the assistance of the blower.
[0042] The head end 700 of the piston is received in the
large-diameter section 202, and the piston rod 701 is at least
partially exposed outside the he large-diameter section 202. The
tail end 702 has a ring 402 and a hole provided in the central area
of the ring 402. The motor drives the piston by a transmission
assembly. The transmission assembly includes a gear plate 410
driven by the motor 400, an eccentric wheel 403, a rotating shaft
411 located in the center of the gear plate 410 and connected to
the eccentric wheel 403, and a transmission rod 405 located on the
eccentric wheel. The transmission rod 405 is sleeved in the ring
402 of the tail end of the piston. The motor drives the gear plate
410 to rotate, and the gear plate 410 drives the piston to linearly
slide back and forth in the inflating tube via the eccentric wheel
403.
[0043] In the present disclosure, the transmission rod 405 is
sleeved in the ring 402 of the tail end of the piston. An outer
diameter of the transmission rod 405 is smaller than an inner
diameter of the ring 402 so that the transmission rod 405 has a
rotation area so as to reduce the influence on the displacement of
the piston's movement path. The transmission rod 405 pushes and
pulls the piston to make linear sliding.
[0044] A frame 401 is arranged in the housing 100 for supporting
the transmission assembly. The gear plate 410 is supported by the
frame.
[0045] The gear plate 410 has an external teeth provided on the
outer periphery of the gear plate 410. The motor 400 has a shaft
with a transmission gear, the gear plate 410 meshes with the
transmission gear of the motor 400.
[0046] The communicating pipe 300 includes a first pipe section
connected with the inflating tube and a second pipe section
connected with the inlet tube 203, and the first pipe section is
connected to the second pipe section. In this way, it is convenient
to assemble, and facilitate subsequent maintenance, etc. The
one-way valve 500 may be arranged in the first pipe section or the
second pipe section, depending on actual needs.
[0047] the tail end of the piston has a hole provided in the
central area of the tail end, and the transmission rod is at least
partially sleeved in the hole.
[0048] Referring to FIGS. 7-8, two power supplies and two power
supply protection units are shown. In fact, the two power supply
units may be one same power supply unit 31, and the two power
supply protection units are one same power supply protection unit
34.
[0049] In the embodiment, the controller 800 includes a controlling
circuit for controlling the operating state of the air pump. The
controlling circuit includes a power supply 31, a controlling unit
32, two selecting switches 331 and 332, a power protection unit 34,
and an inflation speed controlling unit 35 and a power switch
36.
[0050] The power supply 31 is used to provide working power for
each unit. The power supply 31 may convert the live wire voltage in
the power grid into the working voltage required by each circuit
after step-down rectification and filtering, or it may be a DC
voltage source such as a 6-volt power source.
[0051] Each of the two selecting switches 331 and 332 has an input
terminal connected with the power supply, an output terminal
connected with the air pump, a ground terminal, and a controlling
terminal connected with the controlling unit 32. The selecting
switch includes a connecting terminal connected to the air pump,
and the connecting terminal of the selecting switch is selectively
connected to the input terminal or the ground terminal of the
selecting switch according to an selecting signal from the
controlling unit 32.
[0052] The controlling unit 32 is configured to output a selecting
signal to the selecting switches 331 and 332, so that the output
terminals of the selecting switches 331 and 332 are selectively
connected to the input terminal or connected or disconnected to the
ground terminal.
[0053] During the air pump is working, a coil of the air pump will
generate a reverse voltage, and the reverse voltage may damage the
power supply 31. A power protection unit 34 is arranged between the
power supply 31 and the air pump to protect the power supply 31.
The power supply protection unit 34 is directly connected between
the power supply 31 and the air pump.
[0054] The inflation speed controlling unit 35 controls the
inflation speed of the air pump by controlling the time for the
current to flow through the air pump. Therefore, the inflation
speed controlling unit 35 is provided at a position capable of
turning on or off the current path of the air pump. For example,
the inflation speed controlling unit 35 is arranged between the
ground terminals and the ground terminals of the selecting switches
331 and 332, or arranged between the power supply unit 31 and the
input terminals of the selecting switches 331 and 332, or arranged
between the air pump and the two selecting switches 331 and
332.
[0055] The power switch 36 is used to control the on-off of the air
pump controlling circuit and the power source, and is equivalent to
the main power switch.
[0056] The power supply 31 includes a power, a first resistor R1, a
second resistor R2, a switch K1, and a voltage stabilizing
module.
[0057] The controlling unit 32 includes a D-type flip-flop, a first
transistor Q1, a second transistor Q2, a third resistor R3, a
fourth resistor R4, a fifth resistor R5, and a sixth resistor
R6.
[0058] The selecting switches 331 and 332 include a first P-channel
depletion type field effect transistor, which is defined as a first
field effect transistor T1, and a second P-channel depletion type
field effect transistor which is referred to as a fourth field
effect transistor T4, a first N-channel depletion type field effect
transistor which is defined as a second field effect transistor T2,
and a second N-channel depletion type field effect transistor which
is defined as third field effect transistor T3. The first field
effect transistor T1 and the second field effect transistor T2
constitute a first selecting switch 331. The third field effect
transistor T3 and the fourth field effect transistor T4 constitute
a second selecting switch 332.
[0059] The power protection unit 34 includes a first diode D1, a
second diode D2, a third diode D3, a fourth diode D4, and a first
capacitor C1.
[0060] The inflation speed controlling unit 35 includes a seventh
resistor R7, an eighth resistor R8, a second capacitor C2, and a
fifth field effect transistor T5.
[0061] The power switch 36 includes a ninth resistor R9 and a sixth
field effect transistor T6.
[0062] The connection relationship of the electronic components in
the power supply 31, the controlling unit 32, the selecting
switches 331 and 332, the power protection unit 34, the inflation
speed controlling unit 35, and the power switch 36 may be described
below.
[0063] The power supply 31 is a +6V power, and may also be another
DC power supply greater than +6V. The power source is connected to
the input terminal Vin of the voltage stabilizing module after
passing through the first resistor R1. After the second resistor R2
and the switch K1 are connected in series, the opposite end of the
second resistor R2 and the switch K1 and the opposite end of the
switch K1 and the second resistor R2 are respectively connected to
the input terminal Vin and the output terminal Vout of the voltage
stabilizing module. That is, the second resistor R2 and the switch
K1 are connected in series and connected in parallel with the
voltage stabilizing module. The second resistor R2 is a
short-circuit resistor. When the voltage of the power supply is
greater than the voltage required by the air pump, the switch K1 is
turned off, and the voltage from the power supply is reduced by the
voltage regulator module to provide voltage for the air pump and
other electronic components that need to be powered. When the
voltage of the power supply 31 is equal to the voltage required by
the air pump, the switch K1 is turned on, and the voltage from the
power supply can directly provide voltage to the air pump and other
electronic components that need to be powered via the second
resistor R2. This means of directly supplying power by the second
resistor R2 can reduce the loss of electric energy by the voltage
stabilizing module, thereby improving the efficiency of the power
supply. The voltage stabilizing module in this embodiment may use
the voltage stabiliser 1117-3.3V of AMS Company.
[0064] In the selecting switches 331 and 332, the drains of the
first FET T1 and the second FET T2 are connected as the output
terminal of the first selecting switch 331, which is connected to
the first terminal 1 of the air pump. The drains of the third field
effect transistor T3 and the fourth field effect transistor T4 are
connected as the output end of the second selecting switch 332,
which is connected to the second terminal 2 of the air pump. The
sources of the first field effect transistor T1 and the fourth
field effect transistor T4 are respectively used as the input
terminals of the first selecting switch 331 and the second
selecting switch 332, which are connected to the output terminal
Vout of the voltage stabilizing module. The sources of the second
field effect transistor T2 and the third field effect transistor T3
serve as the ground terminals of the first selecting switch 331 and
the second selecting switch 332, respectively, and are connected to
the source of the fifth field effect transistor T5. The gates of
the first field effect transistor T1 and the second field effect
transistor T2 are connected as the controlling terminal of the
first selecting switch 331. The gates of the third field effect
transistor T3 and the fourth field effect transistor T4 are
connected as the controlling terminal of the second selecting
switch 332.
[0065] In the controlling unit 32, the base of the first transistor
Q1 is connected to the Q output terminal of the D flip-flop through
the sixth resistor R6. The collector of the first transistor Q1 is
connected to the grids of the third field effect transistor T3 and
the fourth field effect transistor T4. At the same time, the fifth
resistor R5 is connected to the output terminal Vout of the voltage
stabilizing module. The emitter of the first transistor Q1 is
connected to the housing of the electronic blood pressure monitor.
The base of the second transistor Q2 is connected to the output
terminal Q of the D flip-flop through the fourth resistor R4. The
collector of the second transistor Q2 is connected to the gates of
the first field effect transistor T1 and the second field effect
transistor T2. At the same time, the third resistor R3 is connected
to the output terminal Vout of the voltage stabilizing module, and
the emitter of the second transistor Q2 is electrically connected
to the housing 100.
[0066] In the power protection unit 34, the cathode of the first
diode D1 and the anode of the second diode D2 are connected to the
first terminal 1 of the air pump. The cathode of the third diode D3
and the anode of the fourth diode D4 are connected to the second
terminal 2 of the air pump. The anodes of the first diode D1 and
the third diode D3 are electrically connected to the housing. The
cathodes of the second diode D2 and the fourth diode D4 are
connected to the output terminal Vout of the voltage stabilizing
module. At the same time, it is electrically connected to the
casing through the first capacitor C1.
[0067] In the inflation speed controlling unit 35, the gate of the
fifth field effect transistor T5 is connected to the TXAO output
terminal (not shown in figure) of the first microcontroller through
the seventh resistor R7 and the eighth resistor R8. The speed
controlling signal unit in the first microcontroller outputs a
speed controlling signal. The source of the fifth field effect
transistor T5 is connected to the source of the third field effect
transistor Q3, and the drain of the fifth field effect transistor
T5 is connected to the source of the sixth field effect transistor
T6. One end of the second capacitor C2 is connected to one end of
the seventh resistor R7 and the eighth resistor R8, and the other
end of the second capacitor C2 is connected to the source of the
fifth field effect transistor T5. During use, the first
microcontroller outputs a PWM modulation wave to the fifth FET T5.
The second capacitor C2 removes a noise signal from the first
microcontroller, and avoid affecting the on or off time of the
fifth FET T5 due to noise in the circuit, so as to better control
the inflation speed of the air pump.
[0068] The gate of the sixth field effect transistor T6 in the
power switch 36 is connected to the PUMPC output terminal (not
shown in the figure) of the first microcontroller through a ninth
resistor R9. The power controlling unit in the first
microcontroller outputs a signal to turn on or off the power. The
source of the sixth field effect transistor T6 is connected to the
drain of the fifth field effect transistor T5, and the drain of the
sixth field effect transistor T6 is connected to the housing.
[0069] While the present disclosure has been described with
reference to a specific embodiment, the description of the
disclosure is illustrative and is not to be construed as limiting
the disclosure. Various of modifications to the present disclosure
can be made to the exemplary embodiment by those skilled in the art
without departing from the true spirit and scope of the disclosure
as defined by the appended claims.
* * * * *